Skip to main content

Documentation Index

Fetch the complete documentation index at: https://docs.anyfast.ai/llms.txt

Use this file to discover all available pages before exploring further.

GPT-5.5 is available through Anyfast via the OpenAI Responses API (/v1/responses). It is OpenAI’s most capable frontier model, designed for the most demanding professional and coding tasks.

​
Key capabilities

  • Responses API — Uses the newer /v1/responses endpoint with input instead of messages
  • Advanced reasoning — Supports reasoning effort levels: none, low, medium (default), high, and xhigh
  • Verbosity control — Set response verbosity to low, medium, or high
  • Streaming — Supports real-time token streaming via SSE
  • Tool use — Supports function calling, web search, file search, and computer use

​
Quick example

curl https://www.anyfast.ai/v1/responses \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "input": [
      { "role": "user", "content": "Explain quantum entanglement in simple terms." }
    ],
    "reasoning": {
      "effort": "high",
      "summary": "auto"
    },
    "text": {
      "format": { "type": "text" },
      "verbosity": "medium"
    },
    "store": true
  }'

​
Parameters

ParameterTypeRequiredDescription
modelstringYesMust be gpt-5.5
inputarrayYesList of { role, content } objects
streambooleanNoEnable SSE streaming. Default: false
temperaturefloatNo0–2. Controls randomness. Default: 1
max_output_tokensintegerNoMaximum output tokens to generate. Minimum: 16
stopstring / arrayNoSequences that stop generation
reasoningobjectNo{ effort, summary } — effort: none / low / medium / high / xhigh
textobjectNo{ format, verbosity } — controls output format and verbosity
toolsarrayNoList of tools the model may call
storebooleanNoStore response for later retrieval. Default: true

API Reference

View the interactive API playground for GPT-5.5.